imx8: Add a default reset_cpu() implementation

Add a weak default reset_cpu() implementation just like
it is done on arch/arm/mach-imx/cpu.c.

This allows the removal of the empty reset_cpu() in several
board files.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Tested-by: Hiago De Franco <hiago.franco@toradex.com> # Toradex Colibri iMX8X
8 files changed